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(No Model.) 2 Sheets-Sheet 1.

J. P. A. SGHLAEFLL ELECTRIC CLOCK. No. 288,496. Patented Nov. 13, 1883.

2 SheetsSheet 2.

(Nu Model.)

I J. P. A. SGHLABFLI.

ELECTRIC CLOCK. No. 288,496. Patented Nov. 13, 1883.

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JEAN PAUL ARNOLD SOHLAEFLI, OF SOLEURE, SW'ITZERLAND.

ELECTRIC CLOCK.

SPECIFICATION forming part of Letters Patent No. 288,496, dated November 13, 1883.

Application filed January 20, 1883. (N0 model.) Patented in England July 7, 1882, No. 3,233; in France January 4,1883, X0. 152,963; in Belgium January 1883, No. 60,086, and in Germany January 17, 1883, No. 23,335.

To (tZZ whom it may concern.-

Be it known that I, JEAN PAUL ARNOLD SCHLAEFLI, of Soleure, in the canton of Soleure, Switzerland, have invented a new and useful Improvement in Electric Clocks, of which the following is a full, clear, and exact description, reference being had to the annexed drawings, forming part of this specification.

This invention relates to an improved secon dary electric clock to be actuated by a weight raised periodically by a current sent at fre quent intervals from a central station.

The mechanism of the clock consists of a horizontal or gravity lever of sufficient weight to actuate the wheel-work, provided with an armature, and adapted to be raised periodically by an electromagnet in circuit with the central station, the said lever being provided with a propelling-pawl acting intermittently on the minutewheel arbor, whose movement is controlled by an escapement, as hereinafter more particularly described.

In the drawings, Figure l is a rear elevation of the clock mechanism with the back plate of the frame removed. Fig. 2 is a plan, and Fig. 3 is a side elevation, of the mechanism.

A is the lever, by the gravity of which the mechanism is intermittently actuated. It is pivoted at a between the front and back plates of the clock-frame. Its short arm carries the armature B of an clectro-magnet, G, fixed at one side of the frame, and having its coils con nected with the terminals D Dthe one directly and the other through the metallic frame of the clock.

E is the propelling arm or pawl, pendent from the gravity-lever A, to which it is loosely pivoted at c. This pawl is pressed by a spring, c, into engagement with a ratchet-wheel, F, on the minute-hand arbor G, and is adapted to move the wheel one tooth at every descent of the lever. The wheel is to have sixty teeth if the current is to be sent every minute; or other number of teeth may be employed, according to the frequency of the transmission of the current. A retaining-pawl, f, pressed by a spring, f, into engagement with the wheel F, prevents its return when the lever A and pawl E are raised. A gear-wheel, H, also secured to the minute-hand arbor G, engages with a pinion, t, on the axis i of an escapement-wheel, I. This wheel has three teeth (more or less, according to the ratio of the wheel and pinion and the intervals at which the current is transmitted) located at equal distances around its circumference,with which teeth an esca1: ement-detent, K, on an arbor, K, is made to engage by a spring, Z. The detent K is raised, when the lever A rises, by an arm, a, which takes under it and is attached to the lever A, in order to permit of the es capement-wheel I being advanced one tooth by the descent of said lever A, at which moment the detent K is dropped in front of the next succeeding tooth oi the wheel. The escapement-whecl I is held stationary during the rise of the gravity-lever A by another detent or brake, L, which is pressed by a spring, 2, against the wheel I when the detent K is disengaged, and is raised free of the wheel by a stud, Z, on the gravity-lever,which presses in its descent upon the tail end of said detent, in order to permit the advance of the wheel.

The clock has no pendulum or balancewheel to regulate its rate of going, but is dependent solely upon the frequency ,of the transmission of the current, the minute-hand being moved intermittently at minute-inter *als over the distance of one minute-space 011 the dial,

and remaining stationary between whiles. The minutehand is to fixed on the arbor G, and the hour-hand is to be actuated therefrom through the usual means. The line-wire is to be attached to the terminalsD D, of which the one D is to be in electrical connection with the back plate of the clock-frame, and the other insulated therefrom. The electric current is to be transmitted periodically by the closing of the circuit by a normal clock at a central station, as is well understood, a number of these secondary clocks being placed in the same circuit and actuated from the standard clock.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s

The combination, with the minute-arbor G, ment in electric clocks signed by me this 23d carrying gear-Wheel H, and the escapementday of December, 1882.

wheel I, having on its axis the pinion z, of the arbor k, carrying detent K, the spring k, the SCHLAEFLI' 5 spring-pressed brake L, and the actuating-1e Witnesses:

ver A, connected with detent K by an arm, a, J. AUGUSTE STAUFFER, as and for the purpose specified. THEoDoR SCHLAEFLI,

The foregoing specification of my improve- Both of Soleure. 

